Listen to CommandQueue.Callbacks#onDisplayRemoveSystemDecorations and...

Listen to  CommandQueue.Callbacks#onDisplayRemoveSystemDecorations and #onDisplayAddSystemDecorations to remove/add status bar.

Flag: com.android.systemui.shared.status_bar_connected_displays
Bug: 384694270
Test: atest com.android.systemui.statusbar.core.MultiDisplayStatusBarStarterTest
Test: atest com.android.systemui.statusbar.data.repository.StatusBarPerDisplayStoreImplTest
Change-Id: Ieb9a0361085ae863b00c1b5ca3964ce2f6855376